/**
 *    Copyright 2006-2016 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package cog.support.mybatis.generator.extend;

import static org.mybatis.generator.internal.util.StringUtility.stringHasValue;

import org.mybatis.generator.api.dom.xml.Attribute;
import org.mybatis.generator.api.dom.xml.TextElement;
import org.mybatis.generator.api.dom.xml.XmlElement;
import org.mybatis.generator.codegen.mybatis3.xmlmapper.elements.AbstractXmlElementGenerator;

/**
 * 
 * @author Jeff Butler
 * 
 */
public class PaginationElementGenerator extends AbstractXmlElementGenerator {

    public PaginationElementGenerator() {
        super();
    }

    @Override
    public void addElements(XmlElement parentElement) {
        String fqjt = introspectedTable.getExampleType();

        XmlElement answer = new XmlElement("select");
        answer.addAttribute(new Attribute("id","returnPaginationList"));
        answer.addAttribute(new Attribute("resultMap",introspectedTable.getBaseResultMapId()));
        answer.addAttribute(new Attribute("parameterType", fqjt)); 

        context.getCommentGenerator().addComment(answer);

        answer.addElement(new TextElement("select")); 
        XmlElement ifElement = new XmlElement("if"); 
        ifElement.addAttribute(new Attribute("test", "distinct"));
        ifElement.addElement(new TextElement("distinct")); 
        answer.addElement(ifElement);

        StringBuilder sb = new StringBuilder();
        if (stringHasValue(introspectedTable.getSelectByExampleQueryId())) {
            sb.append('\'');
            sb.append(introspectedTable.getSelectByExampleQueryId());
            sb.append("' as QUERYID,"); 
            answer.addElement(new TextElement(sb.toString()));
        }

        answer.addElement(getBaseColumnListElement());

        sb.setLength(0);
        sb.append("from "); 
        sb.append(introspectedTable.getAliasedFullyQualifiedTableNameAtRuntime());
        answer.addElement(new TextElement(sb.toString()));
        answer.addElement(getExampleIncludeElement());


        ifElement = new XmlElement("if"); 
        ifElement.addAttribute(new Attribute("test", "orderByClause != null"));
        ifElement.addElement(new TextElement("order by ${orderByClause}")); 
        answer.addElement(ifElement);

        answer.addElement(new TextElement("limit ${limitStart},${limitEnd}"));

        parentElement.addElement(answer);


        XmlElement answerCount = new XmlElement("select"); 

        answerCount.addAttribute(new Attribute("id","returnPaginationCount"));
        answerCount.addAttribute(new Attribute("parameterType", fqjt)); 
        answerCount.addAttribute(new Attribute("resultType", "java.lang.Integer"));

        context.getCommentGenerator().addComment(answerCount);

        StringBuilder sbCount = new StringBuilder();
        sbCount.append("select count(1) from ");
        sbCount.append(introspectedTable.getAliasedFullyQualifiedTableNameAtRuntime());
        answerCount.addElement(new TextElement(sbCount.toString()));
        answerCount.addElement(getExampleIncludeElement());

        parentElement.addElement(answerCount);
    }
}
